Something like this in the logs would imply that the message was unicast
directly to the DHCP server:
May 11 13:46:45 dhcp1 dhcpd: DHCPREQUEST for 209.237.98.81 from
00:1d:7e:19:a9:f1 via eth0
May 11 13:46:45 dhcp1 dhcpd: DHCPACK on 209.237.98.81 to 00:1d:7e:19:a9:f1
via eth0
Whereas this would mean that it was broadcast by the client and then sent to
the server via the configured relay:
May 11 13:47:01 dhcp1 dhcpd: DHCPINFORM from 209.237.126.187 via
209.237.96.62
May 11 13:47:01 dhcp1 dhcpd: DHCPACK to 209.237.126.187 (00:11:11:e7:fa:2c)
via eth0
Am I interpreting that correctly?
Ben Wiechman